From: Jeremy Fitzhardinge Date: Mon, 29 Nov 2010 22:16:53 +0000 (-0800) Subject: xen: don't bother to stop other cpus on shutdown/reboot X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=31e323cca9d5c8afd372976c35a5d46192f540d1;hp=3561d43fd289f590fdae672e5eb831b8d5cf0bf6;p=deliverable%2Flinux.git xen: don't bother to stop other cpus on shutdown/reboot Xen will shoot all the VCPUs when we do a shutdown hypercall, so there's no need to do it manually. In any case it will fail because all the IPI irqs have been pulled down by this point, so the cross-CPU calls will simply hang forever. Until change 76fac077db6b34e2c6383a7b4f3f4f7b7d06d8ce the function calls were not synchronously waited for, so this wasn't apparent. However after that change the calls became synchronous leading to a hang on shutdown on multi-VCPU guests. Signed-off-by: Jeremy Fitzhardinge Cc: Stable Kernel Cc: Alok Kataria --- diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 235c0f4d3861..4a5973abefc8 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1016,10 +1016,6 @@ static void xen_reboot(int reason) { struct sched_shutdown r = { .reason = reason }; -#ifdef CONFIG_SMP - stop_other_cpus(); -#endif - if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r)) BUG(); }